Unpopular opinion of the day.
I personaly think yasuo's move set is fine. He take skill to master his passive shield, munipulating minion wave for engage/escape. Chargeing your dash to hit your enemy hard, but not screwing over your own escape. Hit ult can easily screw you over. Also a little cc or exhaust and hes dead. His windwall causes people issues, but you just have to play around it, you know like any other shield. Pick a champion that isnt affected by the wall. Now saying this his synergy with items is the issue. I dont he himself needs nerfs or move changes the items need tweaked. Im not a Yasuo main, im not particularly good at him. I love watching a good player fly around on him though. He has down sides and people dont seem to know how to combat him.